A jihadist involved in the brutal killing of an elderly priest pledged to attack France in a newly released video, as Catholic bishops called for a day of prayer in a nation shaken by the latest assault.

Militants on Thursday attacked Bangladeshi police guarding the country's biggest festival marking the end of Ramadan, killing three people and wounding 14, days after Islamic State claimed a major attack in the capital and warned of more violence.

Bangladesh police sought more information on Monday from friends and family of the men suspected of carrying out a deadly attack on a restaurant in the capital, and some are believed to have attended top schools and colleges at home and abroad.

After chanting "Allahu akbar", those gathered for Friday prayers at Brussels' Grand Mosque streamed outside to chant "Long Live Belgium," feeling the pressure to tackle radicalisation after the attacks on the city.

After chanting "Allahu akbar", those gathered for Friday prayers at Brussels' Grand Mosque streamed outside to chant "Long Live Belgium," feeling the pressure to tackle radicalisation after the attacks on the city.

A combination photograph from around the world shows vigils and prayer ceremonies for the victims of the November 13, 2015 Paris attacks. The photographs (from top to bottom, L to R ) : vigil in Sydney, rally in Rio de Janeiro, vigil in Tel Aviv, vigil in Lausanne, vigil in Marseille, tribute at the French embassy in Warsaw, tribute at Brandenburg gate in Berlin, lit walls of Jerusalem's Old City, and vigil in Seoul. Photo: Reuters/Staff

Pope Francis has urged an audience of U.S. bishops to aid immigrants from Latin American countries. The pontiff was speaking at a prayer service in Washington, D.C. on Wednesday at the beginning of his U.S. tour.